drivers/net/ibm_newemac/zmii.c

   1 /*
   2  * drivers/net/ibm_newemac/zmii.c
   3  *
   4  * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
   5  *
   6  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
   7  *                <benh@kernel.crashing.org>
   8  *
   9  * Based on the arch/ppc version of the driver:
  10  *
  11  * Copyright (c) 2004, 2005 Zultys Technologies.
  12  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  13  *
  14  * Based on original work by
  15  *      Armin Kuster <akuster@mvista.com>
  16  *      Copyright 2001 MontaVista Softare Inc.
  17  *
  18  * This program is free software; you can redistribute  it and/or modify it
  19  * under  the terms of  the GNU General  Public License as published by the
  20  * Free Software Foundation;  either version 2 of the  License, or (at your
  21  * option) any later version.
  22  *
  23  */
  24 #include <linux/slab.h>
  25 #include <linux/kernel.h>
  26 #include <linux/ethtool.h>
  27 #include <asm/io.h>
  28
  29 #include "emac.h"
  30 #include "core.h"
  31
  32 /* ZMIIx_FER */
  33 #define ZMII_FER_MDI(idx)       (0x80000000 >> ((idx) * 4))
  34 #define ZMII_FER_MDI_ALL        (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
  35                                  ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
  36
  37 #define ZMII_FER_SMII(idx)      (0x40000000 >> ((idx) * 4))
  38 #define ZMII_FER_RMII(idx)      (0x20000000 >> ((idx) * 4))
  39 #define ZMII_FER_MII(idx)       (0x10000000 >> ((idx) * 4))
  40
  41 /* ZMIIx_SSR */
  42 #define ZMII_SSR_SCI(idx)       (0x40000000 >> ((idx) * 4))
  43 #define ZMII_SSR_FSS(idx)       (0x20000000 >> ((idx) * 4))
  44 #define ZMII_SSR_SP(idx)        (0x10000000 >> ((idx) * 4))
  45
  46 /* ZMII only supports MII, RMII and SMII
  47  * we also support autodetection for backward compatibility
  48  */
  49 static inline int zmii_valid_mode(int mode)
  50 {
  51         return  mode == PHY_MODE_MII ||
  52                 mode == PHY_MODE_RMII ||
  53                 mode == PHY_MODE_SMII ||
  54                 mode == PHY_MODE_NA;
  55 }
  56
  57 static inline const char *zmii_mode_name(int mode)
  58 {
  59         switch (mode) {
  60         case PHY_MODE_MII:
  61                 return "MII";
  62         case PHY_MODE_RMII:
  63                 return "RMII";
  64         case PHY_MODE_SMII:
  65                 return "SMII";
  66         default:
  67                 BUG();
  68         }
  69 }
  70
  71 static inline u32 zmii_mode_mask(int mode, int input)
  72 {
  73         switch (mode) {
  74         case PHY_MODE_MII:
  75                 return ZMII_FER_MII(input);
  76         case PHY_MODE_RMII:
  77                 return ZMII_FER_RMII(input);
  78         case PHY_MODE_SMII:
  79                 return ZMII_FER_SMII(input);
  80         default:
  81                 return 0;
  82         }
  83 }
  84
  85 int __devinit zmii_attach(struct of_device *ofdev, int input, int *mode)
  86 {
  87         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
  88         struct zmii_regs __iomem *p = dev->base;
  89
  90         ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
  91
  92         if (!zmii_valid_mode(*mode)) {
  93                 /* Probably an EMAC connected to RGMII,
  94                  * but it still may need ZMII for MDIO so
  95                  * we don't fail here.
  96                  */
  97                 dev->users++;
  98                 return 0;
  99         }
 100
 101         mutex_lock(&dev->lock);
 102
 103         /* Autodetect ZMII mode if not specified.
 104          * This is only for backward compatibility with the old driver.
 105          * Please, always specify PHY mode in your board port to avoid
 106          * any surprises.
 107          */
 108         if (dev->mode == PHY_MODE_NA) {
 109                 if (*mode == PHY_MODE_NA) {
 110                         u32 r = dev->fer_save;
 111
 112                         ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
 113
 114                         if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
 115                                 dev->mode = PHY_MODE_MII;
 116                         else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
 117                                 dev->mode = PHY_MODE_RMII;
 118                         else
 119                                 dev->mode = PHY_MODE_SMII;
 120                 } else
 121                         dev->mode = *mode;
 122
 123                 printk(KERN_NOTICE "%s: bridge in %s mode\n",
 124                        ofdev->node->full_name, zmii_mode_name(dev->mode));
 125         } else {
 126                 /* All inputs must use the same mode */
 127                 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
 128                         printk(KERN_ERR
 129                                "%s: invalid mode %d specified for input %d\n",
 130                                ofdev->node->full_name, *mode, input);
 131                         mutex_unlock(&dev->lock);
 132                         return -EINVAL;
 133                 }
 134         }
 135
 136         /* Report back correct PHY mode,
 137          * it may be used during PHY initialization.
 138          */
 139         *mode = dev->mode;
 140
 141         /* Enable this input */
 142         out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
 143         ++dev->users;
 144
 145         mutex_unlock(&dev->lock);
 146
 147         return 0;
 148 }
 149
 150 void zmii_get_mdio(struct of_device *ofdev, int input)
 151 {
 152         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 153         u32 fer;
 154
 155         ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
 156
 157         mutex_lock(&dev->lock);
 158
 159         fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
 160         out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
 161 }
 162
 163 void zmii_put_mdio(struct of_device *ofdev, int input)
 164 {
 165         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 166
 167         ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
 168         mutex_unlock(&dev->lock);
 169 }
 170
 171
 172 void zmii_set_speed(struct of_device *ofdev, int input, int speed)
 173 {
 174         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 175         u32 ssr;
 176
 177         mutex_lock(&dev->lock);
 178
 179         ssr = in_be32(&dev->base->ssr);
 180
 181         ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
 182
 183         if (speed == SPEED_100)
 184                 ssr |= ZMII_SSR_SP(input);
 185         else
 186                 ssr &= ~ZMII_SSR_SP(input);
 187
 188         out_be32(&dev->base->ssr, ssr);
 189
 190         mutex_unlock(&dev->lock);
 191 }
 192
 193 void zmii_detach(struct of_device *ofdev, int input)
 194 {
 195         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 196
 197         BUG_ON(!dev || dev->users == 0);
 198
 199         mutex_lock(&dev->lock);
 200
 201         ZMII_DBG(dev, "detach(%d)" NL, input);
 202
 203         /* Disable this input */
 204         out_be32(&dev->base->fer,
 205                  in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
 206
 207         --dev->users;
 208
 209         mutex_unlock(&dev->lock);
 210 }
 211
 212 int zmii_get_regs_len(struct of_device *ofdev)
 213 {
 214         return sizeof(struct emac_ethtool_regs_subhdr) +
 215                 sizeof(struct zmii_regs);
 216 }
 217
 218 void *zmii_dump_regs(struct of_device *ofdev, void *buf)
 219 {
 220         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 221         struct emac_ethtool_regs_subhdr *hdr = buf;
 222         struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
 223
 224         hdr->version = 0;
 225         hdr->index = 0; /* for now, are there chips with more than one
 226                          * zmii ? if yes, then we'll add a cell_index
 227                          * like we do for emac
 228                          */
 229         memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
 230         return regs + 1;
 231 }
 232
 233 static int __devinit zmii_probe(struct of_device *ofdev,
 234                                 const struct of_device_id *match)
 235 {
 236         struct device_node *np = ofdev->node;
 237         struct zmii_instance *dev;
 238         struct resource regs;
 239         int rc;
 240
 241         rc = -ENOMEM;
 242         dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
 243         if (dev == NULL) {
 244                 printk(KERN_ERR "%s: could not allocate ZMII device!\n",
 245                        np->full_name);
 246                 goto err_gone;
 247         }
 248
 249         mutex_init(&dev->lock);
 250         dev->ofdev = ofdev;
 251         dev->mode = PHY_MODE_NA;
 252
 253         rc = -ENXIO;
 254         if (of_address_to_resource(np, 0, &regs)) {
 255                 printk(KERN_ERR "%s: Can't get registers address\n",
 256                        np->full_name);
 257                 goto err_free;
 258         }
 259
 260         rc = -ENOMEM;
 261         dev->base = (struct zmii_regs __iomem *)ioremap(regs.start,
 262                                                 sizeof(struct zmii_regs));
 263         if (dev->base == NULL) {
 264                 printk(KERN_ERR "%s: Can't map device registers!\n",
 265                        np->full_name);
 266                 goto err_free;
 267         }
 268
 269         /* We may need FER value for autodetection later */
 270         dev->fer_save = in_be32(&dev->base->fer);
 271
 272         /* Disable all inputs by default */
 273         out_be32(&dev->base->fer, 0);
 274
 275         printk(KERN_INFO
 276                "ZMII %s initialized\n", ofdev->node->full_name);
 277         wmb();
 278         dev_set_drvdata(&ofdev->dev, dev);
 279
 280         return 0;
 281
 282  err_free:
 283         kfree(dev);
 284  err_gone:
 285         return rc;
 286 }
 287
 288 static int __devexit zmii_remove(struct of_device *ofdev)
 289 {
 290         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 291
 292         dev_set_drvdata(&ofdev->dev, NULL);
 293
 294         WARN_ON(dev->users != 0);
 295
 296         iounmap(dev->base);
 297         kfree(dev);
 298
 299         return 0;
 300 }
 301
 302 static struct of_device_id zmii_match[] =
 303 {
 304         {
 305                 .compatible     = "ibm,zmii",
 306         },
 307         /* For backward compat with old DT */
 308         {
 309                 .type           = "emac-zmii",
 310         },
 311         {},
 312 };
 313
 314 static struct of_platform_driver zmii_driver = {
 315         .name = "emac-zmii",
 316         .match_table = zmii_match,
 317
 318         .probe = zmii_probe,
 319         .remove = zmii_remove,
 320 };
 321
 322 int __init zmii_init(void)
 323 {
 324         return of_register_platform_driver(&zmii_driver);
 325 }
 326
 327 void zmii_exit(void)
 328 {
 329         of_unregister_platform_driver(&zmii_driver);
 330 }